I don't know all of the examples cited, but bringing up Bret Victor in the sentence immediate following "Beautiful code is more important than beautiful UI" surprised me.

Up and Down the Ladder of Abstraction is still one of my favorite examples of an interactive webpage, and is beautifully elegant in how it integrates with and supports the text.

http://worrydream.com/LadderOfAbstraction/

It's cleanly designed as does exactly what it needs to. Hard to beat, IMO.